640443050 has 48 divisors (see below), whose sum is σ = 1338664320. Its totient is φ = 226184640.

The previous prime is 640443049. The next prime is 640443061. The reversal of 640443050 is 50344046.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6470 + ... + 36369.

It is an arithmetic number, because the mean of its divisors is an integer number (27888840).

Almost surely, 2^640443050 is an apocalyptic number.

640443050 is an abundant number, since it is smaller than the sum of its proper divisors (698221270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640443050 is a wasteful number, since it uses less digits than its factorization.

640443050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42887 (or 42882 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 640443050 is about 25306.9763108910. The cubic root of 640443050 is about 861.9726889530.

Adding to 640443050 its reverse (50344046), we get a palindrome (690787096).

The spelling of 640443050 in words is "six hundred forty million, four hundred forty-three thousand, fifty".